OCZ Technology EVOStream 600W Power Supply (modular PSU)

[freecableguy]

OCZ Technology EVOStream 600W Power Supply
www.ocztechnology.com


Product Highlights and Packaging:

Heavy Duty Power Delivery @ 600W or 700W
High performance systems require stable, reliable power. OCZ delivers. Made by a company you can trust.
Advanced Cable Management System
100% Modular "EZMod Technology" Advanced Cable Management System means you don't need to have extra cables in your system dangling usused! Use only the cables you need resulting in a less cluttered case interior and optimal airflow conditions. The cables are also UV-reactive blue!
Active Power Factor Correction (PFC)
Effectively regulates input voltage to deliver superior stability. PFC (0.99 typical) keeps power usage to a minimum insuring your system is operating as efficiently as possible.
Cooler/Quiter Operation
Increased air flow with an aggressive 80mm fan with brilliant blue LEDs.
Multi-GPU Ready/Dual CPU Ready
Equipped for multi-GPU gaming systems with two PCI-e power cables included.
EMI Isolated Casing
The sleek titanium mirrored chassis effectively reduces EMI emissions that would otherwise effect other components.
36-Month Hassle-Free Exclusive PowerSwap Warranty
OCZ 3 year PowerSwap Warranty Program provides you peace of mind knowing that if you do have a problem OCZ is standing ready to help!
Automatic Short-Circuit Protection
The PSU automatically shuts down in the unlikely event of a short-circuit, preventing damage itself and other nearby equipment.
Restriction of Hazardous Substances (RoHS) Directive compliant



http://members.cox.net/kjboughton/p_1.jpg


Package Contents:


http://members.cox.net/kjboughton/p_5.jpg



1x 600W Power Supply Unit (PSU)
1x User's Manual - Product Features, Technical Specifications, Installation Instructions and FAQs
1x 3-prong wall power cable
1x 20-/24-pin ATX power connector cable
1x 4-/8-pin CPU auxiliary connector cable
2x peripheral 4-pin connector (2 molex connections) cable
1x peripheral 4-pin connector (1 molex, 1FDD connection) cable
1x peripheral 4-pin connector (1 molex connection) cable
2x PCI Express 6-pin connection cable
2x SATA connector (2 hotswap SATA connections) cable



A Closer Look at the Power Ratings:


http://members.cox.net/kjboughton/p_2.jpg


http://members.cox.net/kjboughton/p_3.jpg



3.3V line: 20A max
5V line: 30A max
4x12V line: 15A max per line (40A maximum total 12V regulated output)
Maximum rated continuous load: 600W
Peak load rating: 700W (60 seconds sustained)
Power Regulation: +/-5% on 3.3V, 5V and +12V lines
Efficiency: 75% typical at full load
PFC: 0.99 typical



Before and After Installation:


http://members.cox.net/kjboughton/p_4.jpg


Before: PC Power and Cooling Turbo-Cool 510 SLI :eek:
After: OCZ EVOStream 600W :D

Note: Even with my hurried attempt to install this PSU as fast as I could (excitement was my enemy) you can clearly see the difference this PSU makes! More room and more airflow means a cooler overall system. I also noticed a decrease in fan noise with this PSU which is in keeping with my new goal to make my systems as quiet as possible for maximum enjoyment.


Personal Commentary:

Those that know me know that I don't hold back my opinions. If I don't like something rest assured I'll let you know. ;) Now let me say this. I like this PSU....a lot. And I'll give you two big reasons, 1) With alittle work this PSU can go a long way to making a well-organized case interior. For me a good looking system is just as important as a fast running one. And 2) Power, and lots of it. What's even better is that I don't have to sacrifice my ears in the process. I'll be converting this system to watercooling soon. Now that I've installed this power supply there's no way I'm going to let me undervolted CPU fan be the loudest part of this system. :rolleyes:

The cables are beautifully assembled and don't feel cheap at all. At the same time they do bend easily and are extremely easy to route. The 100% modular design in a real plus. I love being able to install only the cables I need. The kit is perfect but I would like to see OCZ sell replacement/extra cables of varying length to be made available for purchase separately. Now that we've got a modular PSU let's take advatage of that! Difference colors would be nice too for those that are really looking to customize their system(s). :D

I experienced absolutely no stability problems with the PSU. The fit and finish are outstanding and are worth of display. The EVOStream line of PSU's from OCZ promise to be another great set of products from a company we have grown to love!


-FCG

http://members.cox.net/kjboughton/ttr.png

[party animal]

nice review FCG! I've been thinking about what PSUs to get for my up coming Conroe, but still havent decided. Glad to hear that the cables arent stiff like the Modstream ones.

[eva2000]

nice ... i'm in process of testing my 600W OCZ Evostream as well :)

[NickS]

Looks good, but still no adjustable pots like Powerstreams :(

[eva2000]

FYI, the 600W Evostreams are set so their rails out of the box are

+3.3v = ~3.4v
+5v = ~5.2v
+12v = ~12.2v

Which should be enough for most folks without going too extreme. That's what i have been told. Actual testing a bit later ... or FCG might have some of those results :)

[LordofDoom]

BTW, what is this priced at again, if not mentioned before? I wanna know how it compares with the Corsair HX620 PSU.

-Satan

[Faction]

Wait I thought this was supposed to come out in Dec.?

[WeStSiDePLaYa]

need inside shots to be able to see the componets.

also, i like how they claim APFC saves electricity, it actually lowers psu effeciency.

[Supertim0r]

can't wait to add an other OCZ product to my collection :D

[revlimiter9000]

Nice review freecableguy. :)

[mr_knowitall15]

lookin AWEOME! Finally a really nice PSU thats also modular. And blue. Looks like one of these will find its way into my new build. When are they available?

[Super Nade]

Estimated pricing in the US please? :)

[Sneaky]

why do the wires have to be blue with white molexes...

it could be a nice silver wires with black molexes or black with black...

just cause it has blue wires takes my interest away from this :(

[RyderOCZ]

why do the wires have to be blue with white molexes...

it could be a nice silver wires with black molexes or black with black...

just cause it has blue wires takes my interest away from this :(If we made silver or black with black....someone would have wanted some other color and said the same thing ;) hehe

[mr_knowitall15]

If we made silver or black with black....someone would have wanted some other color and said the same thing ;) hehe
QFT!!!
How can they make a product that would please EVERYONE? thats pretty impossible, even if they offered it in a few differennt color schemes. Personally, i like this ones. If you dont, spend like 15 bucks and get a PSU sleeving kit, and i know you can also get different color connectors as well.

[DAK1640]

Hmmm...I own the OCZ 520 & the Powerstream 600W and both are excellent. This seems to be another beauty from OCZ...I too am curious as to how much $$$:toast:

[Sneaky]

If we made silver or black with black....someone would have wanted some other color and said the same thing ;) hehe

but everyone loves blue? :stick:

[Mr. Popo]

but everyone loves blue? :stick:
Well... yeah! :D
Also, I must say it's one of most beautiful PSUs I've ever seen! :toast:
Nice work OCZ (If you want, I'll take one for free. :D )! :up:

[erwinz]

thanks for the review.. :D

[Super Nade]

Nice work OCZ (If you want, I'll take one for free. :D )! :up:

Free? Cool, I'll take one for free as well! Nice of you guys to start off a new product with hand-outs. :D

[Mankz_91]

i like them.... where can i get one in the UK..?

[NightCrawler™]

I think I'm going to wait for a 700W version and then sell my GameXStream....

[RyderOCZ]

I think I'm going to wait for a 700W version and then sell my GameXStream....Think bigger ;) :D

[NightCrawler™]

1kw....?? :D:D

[RyderOCZ]

:wasntme: :wasntme:

[NightCrawler™]

Damn 07 is going to be an expensive year..... :(

[eva2000]

Think bigger ;) :D
more like 850W with quad +12v rails at 20amps each ;) :D

http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/thumbnails/thumb_Infinity_001.jpg (http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/photos/Infinity_001.html) http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/thumbnails/thumb_Infinity_005.jpg (http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/photos/Infinity_005.html) http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/thumbnails/thumb_Infinity_014.jpg (http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/photos/Infinity_014.html) http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/thumbnails/thumb_Infinity_017.jpg (http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/photos/Infinity_017.html)

Scythe Infinity with 2x 120x25mm Thermaltake 81cfm 0.40AMP fans push-pull config

Bios value => Intel Desktop Utilities value (windows)
CPU idle = 51-52C => 40-41C
System Zone 1 idle = 33C => 34C
System Zone 2 idle = 30-31C => 31C

Intel Desktop Utilities value (windows)
CPU load = 55-57C
System Zone 1 load = 37-39C
System Zone 2 load = 32-34C

Room temp = 26.1C

Load (click image for larger image)
http://fileshosts.com/intel/Intel975x/975xbx_results/955XE/scytheinfinity/81cfm/ocz/7200gold/12/1334/13x/2x81cfm/533/266-266-44412_1.23-1.65-1.333-2.1/stressprime_load_tnn.jpg (http://fileshosts.com/intel/Intel975x/975xbx_results/955XE/scytheinfinity/81cfm/ocz/7200gold/12/1334/13x/2x81cfm/533/266-266-44412_1.23-1.65-1.333-2.1/stressprime_load.png)

http://i4memory.com/reviewimages/cooling/cpu/Scythe/Infinity/thermaltake81cfm_2x/graph_compared_4config.png

================================================== ============
Amazing feat for a 3.46Ghz 955XE Extreme Edition cpu to be quad stressprime 1+hr stable @4399Mhz at 1.476v vcore (bios) - maybe this special psu I'm playing with also had something to do with it ? ;) :D

http://fileshosts.com/intel/Intel975x/975xbx_results/955XE/scytheinfinity/81cfm/ocz/7200gold/12/1334/16x/2x81cfm/533/274-274-44412_1.476-1.65-1.395-2.1/cpuz.png

Scythe Infinity with 2x 120x25mm Thermaltake 81cfm 0.40AMP fans push-pull config

Bios value => Intel Desktop Utilities value (windows)
CPU idle = 79-80C => 55-56C
System Zone 1 idle = 38C => 35C
System Zone 2 idle = 31C => 31C

Intel Desktop Utilities value (windows)
CPU load = 79-81C
System Zone 1 load = 38-40C
System Zone 2 load = 31C

Room temp = 26.8C

Load (click image for larger image)
http://fileshosts.com/intel/Intel975x/975xbx_results/955XE/scytheinfinity/81cfm/ocz/7200gold/12/1334/16x/2x81cfm/533/274-274-44412_1.476-1.65-1.395-2.1/stressprime_load_tnn.jpg (http://fileshosts.com/intel/Intel975x/975xbx_results/955XE/scytheinfinity/81cfm/ocz/7200gold/12/1334/16x/2x81cfm/533/274-274-44412_1.476-1.65-1.395-2.1/stressprime_load.png)

OCZ has an interesting time ahead of them in the psu area :D

[thunderstruck!]

Where's the technical part of the review? All we know is that it is pretty and FCG likes it. :rolleyes:

[trans am]

Why did ocz get rid of the adjustable pots? That was the reason I bought my Powerstream 520w in the 1st place. I feel like this psu is just like all the others minus the fancy modular cables and 4 x 12v lines. How about the OCZ ULTRASTREAM

2k watts
4x12v lines
3x pci-e power dongle (for 3 video cards)
The 1st watercooled psu
comes with 3 year powertrain warranty
adjustable pots
modular cables with uv coating
connects directly to your central air system to save on heating costs in the winter.

[uOpt]

Mumble.

I don't get it. Even in a modular PSU they use these junky 4+4 EPS12V connectors instead of separate 4-pin and 8-pin.

I also don't like that the temperature at which the wattage is valid is not given.

I am not sure that a 4-rail design with a 15 A limit is the right thing to do. A 4-rail works well for me and a multi-processor machine. However, if you want to power a Kentsfield then only one of these rails is going into the CPU no matter what. 180 Watts maximum for the CPU. That will not be sufficient for X overclocks.

[thunderstruck!]

Another reason why I prefer a single, big 12V rail.

[RyderOCZ]

Mumble.

I don't get it. Even in a modular PSU they use these junky 4+4 EPS12V connectors instead of separate 4-pin and 8-pin.

I also don't like that the temperature at which the wattage is valid is not given.

I am not sure that a 4-rail design with a 15 A limit is the right thing to do. A 4-rail works well for me and a multi-processor machine. However, if you want to power a Kentsfield then only one of these rails is going into the CPU no matter what. 180 Watts maximum for the CPU. That will not be sufficient for X overclocks.Just like the GXS...the 8 pin connector has 2 different Rails in it...so your CPU would have up to 360W

[uOpt]

Just like the GXS...the 8 pin connector has 2 different Rails in it...so your CPU would have up to 360W

But the/many Kentsfield boards only use 4 pins. Do you split the first 4-pin into two rails?

BTW, did I ever ask for a diagram of the rail distribution?

[RyderOCZ]

But the/many Kentsfield boards only use 4 pins. Do you split the first 4-pin into two rails?

BTW, did I ever ask for a diagram of the rail distribution?I don't have a diagram...but:

12V1 = CPU1
12V2 = CPU2 / PCI-e2
12V3 = ATX and Molex/Sata Lines
12V4 = PCI-e1

Most of the boards probably didn't plan for Kents is all I can figure. P5B has 8pin, but I now P5W doesn't, Giga and MSI probably don't either.

[[cTx]Philosophy]

Nice review FCG, as always another satisfied OCZ owner..
I love my Powerstream 600, I wish it was modular, but.......

[raccoonone]

nice review:)

[MACMAC]

I would have liked to see some side-by-side numbers between the TurboCool and the EvoStream :fact:

Would that be possible? :D

[RyderOCZ]

Why did ocz get rid of the adjustable pots? That was the reason I bought my Powerstream 520w in the 1st place. I feel like this psu is just like all the others minus the fancy modular cables and 4 x 12v lines. How about the OCZ ULTRASTREAM

2k watts
4x12v lines
3x pci-e power dongle (for 3 video cards)
The 1st watercooled psu
comes with 3 year powertrain warranty
adjustable pots
modular cables with uv coating
connects directly to your central air system to save on heating costs in the winter.Patience young padawan ;)

Why only 4 12V? wouldn't 6 be better?......what about Quad cards...so 4 PCI-e :thumbsup:

We already contracted with a heating company to ensure compatibility with most Furnaces :D:D

[NightCrawler™]

So we get a phasechange along with the PSU.....? :D

[Revv23]

solid psu, cant wait to see the 1kw, though i prefer bigger rails and less of them, at the same time im using a gamexstream so what do i know.

[WeStSiDePLaYa]

solid psu, cant wait to see the 1kw, though i prefer bigger rails and less of them, at the same time im using a gamexstream so what do i know.


well, the GXS does have horrible horrible ripple, even compared to psu's that people think are crappy. and if you take a look inside, you will quickly notice it lacks the meat that quality psu's have.

[JCGhz]

well, the GXS does have horrible horrible ripple, even compared to psu's that people think are crappy. and if you take a look inside, you will quickly notice it lacks the meat that quality psu's have.


So, you have one of these on hand and tested it to reach that conclusion??

[WeStSiDePLaYa]

So, you have one of these on hand and tested it to reach that conclusion??


here you go, have fun.

http://www.jonnyguru.com/PSU/GameXStream700/

and jonnyguru was actually going pretty light on the fact that it had such horrible ripple.

BTW, notice how he said he tested multiple units with same results...

[JCGhz]

here you go, have fun.

http://www.jonnyguru.com/PSU/GameXStream700/

and jonnyguru was actually going pretty light on the fact that it had such horrible ripple.

BTW, notice how he said he tested multiple units with same results...


wow! thanks for that...

[eva2000]

here you go, have fun.

http://www.jonnyguru.com/PSU/GameXStream700/

and jonnyguru was actually going pretty light on the fact that it had such horrible ripple.

BTW, notice how he said he tested multiple units with same results...
one review says ripple poor while some others says it's fine

http://www.extremeoverclocking.com/reviews/cases/OCZ_GameXStream_700W_6.html

http://www.techpowerup.com/printreview.php?id=/OCZ/GameXStream700W

but don't think anyone's tested at 695+ Watts although i did test it pretty loaded http://www.xtremesystems.org/forums/showthread.php?t=99830 but no scope to check it out

[WeStSiDePLaYa]

one review says ripple poor while some others says it's fine

http://www.extremeoverclocking.com/reviews/cases/OCZ_GameXStream_700W_6.html

http://www.techpowerup.com/printreview.php?id=/OCZ/GameXStream700W

but don't think anyone's tested at 695+ Watts although i did test it pretty loaded http://www.xtremesystems.org/forums/showthread.php?t=99830 but no scope to check it out


the first link doesnt have any ripple results, and the second link claims the 12v line has only 15mv of ripple at IDLE.

thats far from stressing a psu.

so i dont think you can say that other reviewers found different results, because they didnt even come close to running the same tests.

[ooeric]

powerstream600 ftw. i dont like any new ocz psu , even if they are more 'efficient'

[WeStSiDePLaYa]

powerstream600 ftw. i dont like any new ocz psu , even if they are more 'efficient'


i would have to agree that the powerstream has been much better than modstream and gamestream. still one of the only mainstream psu's to offer adj. pots.

still unknown about the evostream.

[mr_knowitall15]

AWWWWWWWWW!!!!! I wanted to buy this because im tired of looking at extra cables in my otherwise sexy new rig.. ETA on a powerhouse of this model? :banana:

[RyderOCZ]

AWWWWWWWWW!!!!! I wanted to buy this because im tired of looking at extra cables in my otherwise sexy new rig.. ETA on a powerhouse of this model? :banana:How much of a powerhouse?

See post 27 :D

[Batman!]

Yay! Can you give us any word on when they'll be out? Hopefully if the 600 is under 150. This looks to be my next psu :D.

[dab420]

http://www.newegg.com/Product/Product.asp?Item=N82E16817341004

http://www.ncix.com/products/index.php?sku=21102

[Revv23]

well, the GXS does have horrible horrible ripple, even compared to psu's that people think are crappy. and if you take a look inside, you will quickly notice it lacks the meat that quality psu's have.


I am well aware of how my psu performs.

I love jonny's reviews but he does a poor job of showing what those ripple numbers mean to me. What i am saying is that I have found no conclusive evidence that the ripple of the GXS hurts my OC. My personal belief is that if a mobo is designed properly ripple should not be a problem, within reason of course.

I may test it against my powerstream 520 if i get ambitious. But i doubt results will be much different, IMO as long as you have enough power you are okay. Now in terms of memory OC that is different, most mobo's have terrible memory power delivery, so a psu with a good 3.3v rail can help tremendously. But, the 3.3.v rail isnt so bad on GXS. Not only that, i have a hipro maximizer on the way, so i wont need to worry about that either way. One thing i need to test is video card clocks, im not sure how the power delivery is on my x1900...

In any case certainly less ripple is better, but i feel that too much importance is placed on that, tricking people into buying much more expensive power supplies then they need, thinking that it will improve thier system performance. This isn't neccesarily a bad thing, as these people are getting a high end product in the end so they are being mislead in a good way i suppose.

I really wish i had that new 1kw SR so i could test out between my 520w, my 700w, and the 1kw. I'm not saying 1kw is unessesary, but what i mean is as long as you have enough amps overall for your setup, your cpu overclock shouldnt suffer.

[WeStSiDePLaYa]

I am well aware of how my psu performs.

I love jonny's reviews but he does a poor job of showing what those ripple numbers mean to me. What i am saying is that I have found no conclusive evidence that the ripple of the GXS hurts my OC. My personal belief is that if a mobo is designed properly ripple should not be a problem, within reason of course.

I may test it against my powerstream 520 if i get ambitious. But i doubt results will be much different, IMO as long as you have enough power you are okay. Now in terms of memory OC that is different, most mobo's have terrible memory power delivery, so a psu with a good 3.3v rail can help tremendously. But, the 3.3.v rail isnt so bad on GXS. Not only that, i have a hipro maximizer on the way, so i wont need to worry about that either way. One thing i need to test is video card clocks, im not sure how the power delivery is on my x1900...

In any case certainly less ripple is better, but i feel that too much importance is placed on that, tricking people into buying much more expensive power supplies then they need, thinking that it will improve thier system performance. This isn't neccesarily a bad thing, as these people are getting a high end product in the end so they are being mislead in a good way i suppose.

I really wish i had that new 1kw SR so i could test out between my 520w, my 700w, and the 1kw. I'm not saying 1kw is unessesary, but what i mean is as long as you have enough amps overall for your setup, your cpu overclock shouldnt suffer.



wow,

blissfully ignorant.

[jonnyGURU]

need inside shots to be able to see the componets.


Best I can do on short notice:

http://www.jonnyguru.com/forums/showthread.php?t=232

[WeStSiDePLaYa]

Best I can do on short notice:

http://www.jonnyguru.com/forums/showthread.php?t=232

thanks for the shots.


nice sized coils, good quality caps (chemicons), independent regulation, looks to be good build quality.


looks like OCZ will have a high end psu out now since the modstream and gamestream lower end psu's.

so far its looking really decent, kudos to ocz.

only thing i dont like though is modular ATX connector.:cool:

[dab420]

Wicked, thanks for the images Jonny. Who is plotech?

[Revv23]

wow,

blissfully ignorant.


so you can show me that a better psu will get me higher clocks?

[WeStSiDePLaYa]

so you can show me that a better psu will get me higher clocks?


i can show you a better psu will cause less stress on your componets, and have less of a chance of blowing a cap.

the GXS is for people who are (mostly) ignorant and would rather see a big number, than quality.

i dont care if try to justify your shoddy high-ripple psu.

ive had 250watt & 300watt psu's with more meat, bigger sinks, bigger inductors, and better quality caps than that thing.

[jonnyGURU]

so you can show me that a better psu will get me higher clocks?

It's not about the clocks. It's about how long the components on your motherboard can hold up to filtering all of that ripple and noise so you can get those clocks.

But since the ripple is only at high loads and I doubt you're pushing that PSU to even 1/3 of it's capability, I can understand why you wouldn't realize there's a problem.

[Revv23]

It's not about the clocks. It's about how long the components on your motherboard can hold up to filtering all of that ripple and noise so you can get those clocks.

But since the ripple is only at high loads and I doubt you're pushing that PSU to even 1/3 of it's capability, I can understand why you wouldn't realize there's a problem.


Which is what i meant in my long winded post, i have a pretty beefy system and i bet i wouldnt have any difference between a 1kw, a 700w or a 520w. Thats why i said many are falsely mislead into buying psu's that are overbuilt for thier needs.

Also like i said, if mobo is built well the ripple matters less. high quality components can handle it... Obviously it would be better to have a nice low ripple psu and if i could afford it i would have one, but its not like my GXS is holding back my overclocks... the only thing it may hold back is my ram, like i said, because my mobo has pretty poor vreg situation on the ram.

Just to humor myself i am going to put my 520w powerstram on my 1900xt to see if i can push it a bit higher, the core tops out early and im thinking it may be a power delivery weakness.

[Mankz_91]

http://specialtech.co.uk/spshop/customer/product.php?productid=3016

seems very expenive for a 600W Modular PSU....

[NickS]

i can show you a better psu will cause less stress on your componets, and have less of a chance of blowing a cap.

the GXS is for people who are (mostly) ignorant and would rather see a big number, than quality.

i dont care if try to justify your shoddy high-ripple psu.

ive had 250watt & 300watt psu's with more meat, bigger sinks, bigger inductors, and better quality caps than that thing.


Really shows your intelligence there WSP. Just because it runs cool and has small heatsinks makes it bad? That makes it good! Means it is very efficient. A+ for you. :rolleyes:

As for the "lack of quality caps and inductors," I call BS. It can put out a 700w load easy. If it lacked quality, it would explode or suffer catastrophic meltdown. :rofl:

Just because it has a little ripple AT 700W doesn't mean it's bad. Besides, whoever has a PC that draws 700w obviously has a very powerful, expensive one. They wouldn't buy a $140 PSU if their CPU costs more than most peoples computes on this forum.

[spudnik]

there's an annoying "whump-whump-whump-whump..." boat-prop sound coming from one of the fans of my Powerstream, and both of them buzz. Does the Evostream have a similar aural signature, or is it really smooth?